Signed-off-by: Gregor Zurowski <gregor@zurowski.org>

Fixes gh-947

Adds `@FeignClient.fallbackFactory` to define a `feign.hystrix.FallbackFactory`.

fixes gh-1117

* add config option to not ignore security headers
* fix field documentation of ignoreSecurityHeaders
* add documenation for  zuul.ignoreSecurityHeaders

fixes gh-1096

Helps with the confusion seen in #1365

This eliminates them being created for every zuul request.

Also makes properties consistent accross modules: ribbon.httpclient.*, ribbon.restclient.* and ribbon.okhttp.*

fixes gh-1150

Allow override of /hystrix.stream location via management.port metadata.

fixes gh-1188

fixes gh-1134

fixes gh-1276

fixes gh-1266

This reverts commit 21df6e43.

Add a check to current context as contentLength is already in the context
Get content length from Headers when RibbonCommandContext is built + add tests
Use request content length RibbonRoutingFilter
Add documentation for new zuul.ribbonIsolationStrategy property

fixes gh-339

What we're missing ATM is different documentation versions for different application versions. What this change does is that it's:

- finding out what is the current branch (e.g. 1.0.x)
- finding out out what is the name of the main adoc file (e.g. spring-cloud-sleuth)
- pulling the changes from gh-pages after checkout
- finding out what is the list of comma separated whitelisted branches (via the `docs.whitelisted.branches` prop)
- in gh-pages creating a folder with name of the branch  (e.g. /1.0.x)
copying all the docs/target/generated-docs/ to that folder
- if the branch from which we're calling the script is NOT master then we're changing the ${main.adoc}.html to index.html so that it's easier to access the docs (e.g. http://cloud.spring.io/spring-cloud-sleuth/1.0.x/)

Changed test to use @Qualifier.
Add documentation to reference the new attribute.

Fix issue gh-1054

Fixes gh-1214

fixes gh-1087

Fixes gh-1084